LLM Agent Engineer - Specialist

Mercor; Toronto; On-site; CAD 190,000 - 950,000; Full time

Job summary

Mercor in Toronto is seeking engineers to build and operate LLM agents in production, giving real visibility into how agents are actually used inside a company. You have probably shipped an agent that real users depended on and been on the hook when it broke.

You will work with layers often overlooked: internal monoagents wired into company data, shared company memory, reusable skills and playbooks, and the tool and MCP surfaces agents call, while ensuring visibility of costs and outcomes.

Qualifications

• Experience shipping an agent used by real users.
• Ability to measure impact of changes on agent performance.
• Experience with long-running agents, scheduled jobs and cloud sandboxes.
• Familiarity with internal monoagents and reusable skills/playbooks.

Responsibilities

• Build and operate LLM agents in production.
• Provide visibility into agent usage, costs, and outcomes.
• Support long-running workflows and data integration for agents.

Skills

LLM agent development

Production deployment

Observability

Job description

We are looking for engineers who build and operate LLM agents in production, and who have real visibility into how agents are actually used inside a company.

You have probably:

• Shipped an agent that real users depended on, and been on the hook when it broke.
• Figured out how to tell whether an agent got better or worse after a change.
• Run agents that outlive a single request: scheduled jobs, long-running work, cloud sandboxes.
• Watched your org build an internal assistant, and seen who adopted it and who quietly did not.

We are especially interested in the layers most people do not talk about: internal monoagents wired into company data, shared company memory, reusable skills and playbooks, the tool and MCP surfaces agents call, and how anyone sees what agents did and what they cost.

We pay $100 to $500 for that conversation, paid on completion of the call, with the amount depending on depth of experience.